Secretary of State Marco Rubio said Friday that the U.S. may “move on” from trying to secure a Russia-Ukraine peace deal if there is no progress in the coming days, after months of efforts have failed to bring an end to the fighting. He spoke in Paris after landmark talks among U.S., Ukrainian and European officials produced outlines for steps toward peace and appeared to make some long-awaited progress. A new meeting is expected next week in London, and Rubio suggested that...